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/** DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.** Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.** The contents of this file are subject to the terms of either the GNU* General Public License Version 2 only ("GPL") or the Common Development* and Distribution License("CDDL") (collectively, the "License"). You* may not use this file except in compliance with the License. You can obtain* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific* language governing permissions and limitations under the License.** When distributing the software, include this License Header Notice in each* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.* Sun designates this particular file as subject to the "Classpath" exception* as provided by Sun in the GPL Version 2 section of the License file that* accompanied this code. If applicable, add the following below the License* Header, with the fields enclosed by brackets [] replaced by your own* identifying information: "Portions Copyrighted [year]* [name of copyright owner]"** Contributor(s):** If you wish your version of this file to be governed by only the CDDL or* only the GPL Version 2, indicate your decision by adding "[Contributor]* elects to include this software in this distribution under the [CDDL or GPL* Version 2] license." If you don't indicate a single choice of license, a* recipient has the option to distribute your version of this file under* either the CDDL, the GPL Version 2 or to extend the choice of license to* its licensees as provided above. However, if you add GPL Version 2 code* and therefore, elected the GPL Version 2 license, then the option applies* only if the new code is made subject to such option by the copyright* holder.*/package com.sun.mail.util;import java.io.*;/*** This class implements a Q Encoder as defined by RFC 2047 for * encoding MIME headers. It subclasses the QPEncoderStream class.* * @author John Mani*/public class QEncoderStream extends QPEncoderStream {private String specials;private static String WORD_SPECIALS = "=_?\"#$%&'(),.:;<>@[\\]^`{|}~";private static String TEXT_SPECIALS = "=_?";/*** Create a Q encoder that encodes the specified input stream* @param out the output stream* @param encodingWord true if we are Q-encoding a word within a* phrase.*/public QEncoderStream(OutputStream out, boolean encodingWord) {super(out, Integer.MAX_VALUE); // MAX_VALUE is 2^31, should// suffice (!) to indicate that// CRLFs should not be inserted// when encoding rfc822 headers// a RFC822 "word" token has more restrictions than a// RFC822 "text" token.specials = encodingWord ? WORD_SPECIALS : TEXT_SPECIALS;}/*** Encodes the specified <code>byte</code> to this output stream.* @param c the <code>byte</code>.* @exception IOException if an I/O error occurs.*/public void write(int c) throws IOException {c = c & 0xff; // Turn off the MSB.if (c == ' ')output('_', false);else if (c < 040 || c >= 0177 || specials.indexOf(c) >= 0)// Encoding required. output(c, true);else // No encoding requiredoutput(c, false);}/*** Returns the length of the encoded version of this byte array.*/public static int encodedLength(byte[] b, boolean encodingWord) {int len = 0;String specials = encodingWord ? WORD_SPECIALS: TEXT_SPECIALS;for (int i = 0; i < b.length; i++) {int c = b[i] & 0xff; // Mask off MSBif (c < 040 || c >= 0177 || specials.indexOf(c) >= 0)// needs encodinglen += 3; // Q-encoding is 1 -> 3 conversionelselen++;}return len;}/**** begin TEST program ***public static void main(String argv[]) throws Exception {FileInputStream infile = new FileInputStream(argv[0]);QEncoderStream encoder = new QEncoderStream(System.out);int c;while ((c = infile.read()) != -1)encoder.write(c);encoder.close();}*** end TEST program ***/}